Comic artist Tim Sale has died, according to a post on his official Twitter account.

The announcement did not reveal Sale’s cause of death. However, DC’s Jim Lee reported on social media just a few days ago that Sale had been admitted to the hospital with severe health issues.

Sale’s personal account shared the news of his passing along with a request for fans to share photos and memories in a thread to celebrate his life and work.

“It’s with a heavy sadness that I must announce that Tim Sale passed away today. He passed with the love of his life beside him, and loves all of you very much. Please share photos and stories under this post, as we hope to share them with the community,” the post reads.

Sale had a long, acclaimed career in the comics industry. Teaming with Jeph Loeb, he worked on Batman: The Long Halloween, a fan-favorite arc widely regarded as one of the Caped Crusader’s most iconic stories. The success also led Sale to work on a number of spinoffs, including Catwoman: When in Rome, Haunted Knight, and the recent Long Halloween Special.

Over the years Sale worked on a number of high-profile comics for both DC and Marvel, including Superman For All Seasons at DC and the “colors” series at Marvel (Daredevil: Yellow, Captain America: White, Spider-Man: Blue, and Hulk: Gray).

Sale was 66 years old.